Grinding wheel truing apparatus



Nov. 23, 1943.

c. e. FLYGARE'ET AL V GRINDING WHEEL TRUING APPARATUS Filed May 5, 1942 3 Sheets-Sheet 1 CE Fm EFL YE E'E FRED TMECKE/VZ /E Nov. 23, 1943.

cfe. FLYGARE ET AL 2,335,207

GRINDING WHEEL TRUING APPARATUS Filed May 5, 1942 S'SheetS -Sheet 2 EBFL EFL YEP/RE F950 HMHEKEA/z/E Nov. 23, 1943. c. cs. FLYGARE ET AL I 2,

GRINDING WHEEL TRUING APPARATUSI Filed May 5, 1942 3 Sheets-Sheet 5 FIG 7 EE'RL EFL. YEH 42 j FRED TMHcKEA/z/E Patented Nov. 23, 1943 ter, Masa,

assignors to Norton Company,

. Worcester, Mass.; a corporation of Massachusetts 1 Application May 5, 1942, swam. 441,802

This invention relates to grinding machines, and more particularly to a truingapparatus for truing'the operative .face of a grinding wheel.

, One object of theinvention istoprovide :a simple and thoroughly practical grinding wheel truing apparatuswhich is arranged for truing either a true cylindrical, tapered a; formed face on a grinding wheel. Another object of the invention is to provide a truing apparatus having a freely-movable roller-supported slide for supporting the truing tool. Another object of the invention is to provide a truing apparatus with a cylindrically shaped truing tool slide having a forming bar which passes thorugh an elongated slot in said slide and an adjustable follower axially located within the slide so that the thrust. of the follower relative to the slideis in an axial direction, thereby preventing. cramping of the slideduring a .truing operation.

Another object of the invention is to provide a longitudinally andtransversely movable truing tool slide. provide a truing apparatus having a longitudinally movable slide and a transversely movable truing tool slide thereon and a forming bar and a follower arranged so that the thrust of the latter isin an axial direction relative to the truing tool slide. A further object of the invention is to provide a truing apparatus which may be adjustably swivelled to facilitate the truing of a tapered face on will be in part obvious or in part pointed out hereinafter.

The invention accordingly consists in the featuresof construction, combinations of elements, and arrangements of parts, as will be exemplified 'in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims. A

In the accompanying drawings in which is shown one of various possible embodiments of the mechanical features of this invention, v

Fig. 1 is a right-hand end elevation of a fraggrinding machine, showing ment of a cylindrical the improved grinding wheel truing apparatus; Fig. 2 is a plan view. of the truing apparatus; Fig. 3 is a rear elevation of. the truing apparatus as shown in Figs. 1 and 2 Fig. 4 is a cross sectional view, on an enlarged scale, taken approximatelyon the line 4-4 of Fig.

Fig. 5 is a fragmentary front elevation of the truing tool slide, on an. enlarged scale, taken approximately on the line of Fig. 1;

Fig. 6 is a fragmentary cross sectional view, on is Another object of. the invention is to a grinding wheel. Other objects 6 Claims. 601. 125-11) V c V w an enlargedjscale, taken approximately on the line 3-4 of Fig.1; and

"Fig. 7 is a cross-sectional view, on an enlarged scale, taken approximately on the line 5-,-5 of surface on a clamping 7 block I 5 is supported on a threaded stud l i which is in turn. fixedly supported chine has been illustrated in Fig. 1 i

A portion of a cylindrical type rinding mathe drawings,comprising a longitudinally movabletable I0 anda rotatable grinding wheel ii. The improved truing;device is preferably detachably mounted on the work supporting table ill and comprises a base i2 having dovetailed shaped supporting surfaces l3 which mate with correspondingly shaped surfaces on the table l0. provided with a dovetailed surface M which is arranged to mate with a correspondingly shaped block IS. The clamping nut ii on the stud i1 serves ing block IS in position to securely hold the truing'apparatus base l2 in an operative position on the work supporting table i0.

ily apparent from dovetailed slideway The base l2 pivotallysupports a circular shaped platen i8. A stud l9 passes through the plate i8 and is screw threaded into the base l2. The platen I8 is provided with elongated arcuate shaped slots 20 and 2| Clampingbolts 22 and 23 passthrough the slots 20 and 2| and are screw threaded into the base [2. It'willbe readthe foregoing that the platen l8 may be swivelled about the stud i9 and clamped in the desired position by means of the clamping bolts 22 and 23 The platen I 8 is provided with a dovetailed slideway; 25. A longitudinally traversable' slide 28 is provided with a correspondingly shaped which mates with the slideway 25 so that the slide 26 may be guided in a straight line path relative to the platen I8. The platen I8 is also provided with a plane way 21 which is formed on a downwardly projectingportion 28 of the slide 26. A guide block strip is fastened to the platen I8 and serves to hold the slide 26 downwardly with its plane flat way in operative engagement with the plane way 21 on the platen l8.

A traversing mechanism is provided for traversing the slide 26 longitudinally, comprising a rotatable screw 30 which is screw threaded into a nut ii. The nut Si is fixedly supported on the under side of the longitudinally movable slide 26. The screw 30 is rotatably-supported in a bearing 32 formed in an upwardly extending bracket 33 whichis formed integral with the The table I0 is also by the base l2. VA 7 to lock the clamp r A portion of the "upper part of platen l8. A gear 34 is mounted on the outer end of the screw shaft and meshes with a gear 35 which is rotatably supported on a stud 35. The stud 36 is fixedly supported in the bracket 3|. A manually operable traverse wheel 31 is mounted to rotate the gear 35 so that any rotary motion of the hand wheel 31 will be transmitted through the gears 35--34 to rotate the screw 30, so as to impart a longitudinal traversing movement to the, slide 26.

The slide 26 serves as a support for a transversely movable truing tool slide 40. The slide 40 is preferably cylindrical in shape and is preferably supported by a roller support in order to facilitate a free movement of the slide relative to the longitudinallymovable slide 26. Two sets ofspaced supporting rollers are provided, 'each comprising three symmetrically arranged rollers.

The forward end of the slide 40 is supported by a pair of rollers 4| and 42 which are in turn supported on fixed studs 43 and 44, respectively. An upper roller 45 is supported by means of a stud 46. The stud 46 is provided with an eccentric portion 41 by means of which the axis of the roller 45 may be adjusted toward and from the axis of the slide 40 whereby the roller 45% may be roller 50. The support for this set of rollers is identical with the set just previously described.

The lower supporting rollers 48 I and 49 are mounted on fixed studs and the upper roller 50 is adjusted on an eccentric stud to facilitate adjustment of the roller 50 as'desired. It will be readily apparent from the foregoing disclosure that by adjustment of the rollers 45 and 58,the slide 40 may be freely moved without lost motion therebetween. The provision of the adjustable mounts for-the upper rollers serves 'not only for an initial adjustment but also'serves to compensate for any-wear between the" parts "as' the truing apparatus is used; r v V the 'cylindrically shaped slide is provided with longitudinally extending cut-out portions 52 and 53 formingan outwardly projecting guide 54 which serves to hold the slide 48 against rotary motion. In order to provide free movement thereof, a roller 55 is mounted on a stud 56 which is fixedly mounted relative to the slide 26. The roller 55 rides against one side face of the guide 44. A roller 51 is' 'mounted onaneccentric portion 58 of anadsired. The studs 56 and 59 may belocked in adjusted position by means of nuts 60 and 6!.

When it is desired to adjust the position of the eccentric 58, the nut 6| may be loosened and the stud 59 rotated by placing a screw driver in'the slot formed in the upper part' of the 'screw" threaded portion of the stud 59 to position the eccentric 58 and the roller '51. After thedesired adjustment has been made, the nut 61 is then clamped :in position rigidly to maintain the eccentric 58 and the roller 51 in'adjusted position.

By this adjustment of the roller 51, lost motion maybe taken up and the slide held so that it travels freely in a straight line path.

'faceon the grinding wheel H.

In order to true apredetermined shape on the periphery of the grinding wheel I I, a forming bar 55 is provided. The forming bar passes through an elongated slot 66 formed in the transversely movable slide 48 and through an elongated slot 61 formed in the longitudinally movable slide 26. The opposite ends of the forming bar are fastened to brackets 68 and 69, respectively, which are fixedly mounted to the swivel plate 18. The forming bar 65 is provided with a formed edge portion 10 which in the present case is illustrated as a'plane surface to facilitate truing a cylindrical If desired, a forming bar 65 having an irregularly shaped or curved face 18 may be'provided, if desired, to

true a corresponding shape upon the periphery of the grinding wheel ll. The forward end of the slide 48 is provided I with a truing tool holder 1i which serves as a The arcuate cut-out portion 88 servesto ,surf support for a diamond or truing tool 12. A follower 13is adjustably supported in a manner to be hereinafter describedfby the slide 48; The follower, as shown lnFig, 2, is preferably shaped to correspond with the shape of the truing tool 12 and is formed on the forward edgenf the rod 14 which is held in adjusted position within a" sleeve 15 by means of screws 16'. The sleeve 15 is slidably keyed by means of a. key 11 within a cylindrical bore 18 formed within the slide 48.

To facilitate adjustment of the' follower 13 relative to the slide 48, a nut and screw adjusting' mechanism is provided, comprising a rotatable'screw' which is screw threaded into a threaded aperture 8| formed within the left-hand end of the sleeve 15 (Fig. 4). The outer end of the screw 40 is formed as an enlarged head 82 having spokes 83 which serve as a hand wheel to facilitate adjustment ofthe screw'to position thefollower 13 as desired. The enlarged portion 82 is provided with a groove 84. end cap'or plate 85 is pivotally supported by a stud 86'on the end of the slide 48. The end cap or plate 85' is arranged to be locked in an operative position by means of a clamping screw 81. In order to V facilitate replacement or adjustment of the follower 13,the plate 85 is provided with arcuate shaped cut-out portions 88 and 89, respectively.

round and ride within the groove 84 and the arcuat cut-out portion 89 serves to surround a portion of the clamping screw 81.

When it is desired to remove the follower 13,

the screw or clamping bolt 81 may be loosened and r the plate 85 swung in a clockwise direction (Fig.

5), thus swinging the plate clear of the enlarged knob 82 of the screw 89. after which the screw 80 together withthe sleeve 15 and the follower 13.

may be readily withdrawn so that the follower 13 may be adjusted or interchanged for a new or differently shaped follower when desired.

In order to prevent clamping of the truing tool slide 40 and to provide a free movement thereof.

ing'any tendency of the slide 40 to clamp as it is -moved transversely by the forming bar.

A yieldable means is provided for maintaining the follower in operative contact with the surfacev 10 of the forming bar 65 and may comprise a pair of tension springs and 9| which are connected versely movable truing tool slide 40.

at one end by means of studs 92 and 93, respectively, which are fixedly mounted on the longitudinally movable slide 26. The other ends of the springs 90 and 9| are supported by studs 94 and 95 which are fixedly supported on the trans- These springs, as illustrated, are both arranged to exert tension in the same plane with the axis of the transversely movable truing tool slide 40 and the forming bar 55 and follower 13. It will thus be seen that all of the thrust exerted upon the truing tool slide 40 is in the same plane'a'nd exerts balanced or axial thrust on the truing tool slide 40, thus facilitating a free uncramped movement thereof.

The operation of this improved truing apparatus will be readily apparent from the foregoing disclosure. Assuming the rollers 45, 50 and 51 to have been previously adjusted to facilitate a free controlled transverse movement of the transversely movable truing tool slide 40, the truing tool 12 together with the transverse slide 40 and longitudinally movable slide 25 are moved longitudinally by rotation of the manually operable traversing wheel 31. The spoked wheel 83 may be rotated to adjust the screw 80 so as to adjust the position of the follower 13 relative to the transversely movable truing tool slide 40 so as to position the diamond or truing tool 12 in operative truing contact with the periphery of the grinding wheel H. The truing tool 12 may be adjusted transversely to govern the extent'of the truing operation by manipulation of the spoked wheel 83. After the truing tool has been adjusted transversely, the truing tool may be traversed longitudinally by rotationof the manually operable traverse wheel 31 to traverse. the truing tool 12 across the face of the grinding wheel H to true a true cylindrical surface on the periphery of the wheel II. The desired amount of truing may be obtained by manipulation of the spoked adjusting wheel 83 and by actuation of the manually operable traverse wheel 31.

If it is desired to true an irregular or curved I face on the periphery of the wheel I I, the forming bar 55 may be readily removed and replaced with a similar bar having a formed surface of a shape corresponding to the shape desired to be reproduced on the periphery of the grinding wheel, after which the operation of the truing apparatus is identical with that previously described.

If it is desired to true a frusto-conical face on the periphery of the grinding wheel II, the

clamping bolts 22 and 23 may be loosened and the plate [8 swivelled in either direction about its supporting stud I 9 as a pivot, after which the plate l8 may be clamped in adjusted position by clamping the screws 22 and 23, after which the diamond may be traversed across the periphery of the grinding wheel I l in a path at an angle to the axis of the grinding wheel ll so as to true a tapered face on the periphery of the grinding wheel ll.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinbefore set forth together with many thoroughly practical advantages are We claim 1. In a truing apparatusfor a grinding machine having a rotatable grinding wheel, a truing apparatus base, a transversely movable slide on said base which is arranged to move in a plane normal to the axis of the grinding wheel, a truing tool on one end of said slide, an elongated slot passing through said slide, a forming bar exforming bar and follower being arranged so that the thrust thereof on the slide is in an axial direction to preventcramping of the slide. 7

2. In a truing apparatus for a grinding machine having a rotatable grinding wheel, a truing apparatus base, a transversely movable slide 'which is arranged to move in a plane normal to the axis of the grinding wheel, an anti-friction support on said base to support said slide, a truing tool on one end of said slide, an elongated slot passing through the axis of said slide, a forming bar extending through said slot and fixedly supported relative to said base, an axial bore in said slide, an adjustably mounted follower supported therein, and yieldable means to maintain said follower in operative engagement with said forming bar.

3. In a truing apparatus for a grinding machine having a rotatable grinding wheel, a truing apparatus base, a longitudinally movable slide thereon, a transversely-movable cylindricallyshaped slide which is arranged to move in a horizontal plane normal to the axis of the grinding wheel, a plurality of sets of spaced symmetrically arranged rollers on said longitudinally movable slide to support said transversely movable slide, a truing tool on one end of said transversely movable slide, an elongated slot passing through the axis of said transversely movable slide, a forming bar extending through said slot and fixedly supported relative to said longitudinal slide, an adjustably mounted follower, an axial bore in said transversely movable slide adjustably to support said follower, and yieldable means to maintain said follower in operative engagement with said forming bar, said forming bar, follower and yieldable means being arranged so that their thrust is in an axial direction relative to the transversely movable slide to prevent cramping thereof.

4. In a truing apparatus for a grinding machine having a base, an angularly adjustable swivel platen thereon, a longitudinally movable slide on said platen, a manually operable nut and screw mechanism to traverse said slide longitudinally, a transversely-movable cylindricallyshaped slide on said first slide which is movable in a plane normal to the axis of the grinding wheel, an anti-friction support on said first slide to support said latter slide, a truing tool fixedly A mounted adjacent to one end of said latter slide. an elongated slot passing through the axis of the second slide, a forming bar fixedly mounted relative to said first slide and passing through said slot, an axial bore extending within said second slide, and a follower adjustably mounted within said bore.

5. In a truing apparatus for a grinding machine having a base, an angularly adjustable swivel platen thereon, a longitudinally movable slide on said platen, a manually operable nut and screw mechanism to traverse said slide longitudinally, a transversely-movable cylindricallyshaped slide on said first slide which is movable in a plane normal to the axis of the grinding wheel, a plurality of sets of spaced symmetrically-arranged rollers on said first slide to sup, port said latter slide, a truing tool fixedly mounted adjacent to one end of said latter slide,an elongated slot passin through the axis of the second slide, a forming bar fixedly mounted relative to said first slide and passing through said slot, an axial bore extending within said second slide, and a follower adjustably mounted within said bore. I V

6. In a truingapparatus for a grinding machine having a rotatable grinding wheel, a truing apparatus base, a. transversely-movable cylindripally-shaped slide thereon, a truing tool supported adjacent to oneend of said slide, two sets of spaced, symmetrically arranged rollers on said said slide, a horizontally extending forming bar passing through said slot and fixedly mounted to said base, an adjustable follower within said slide .which is engageable with said forming bar, and a pair of spaced tension springs which are arranged in a horizontal plane with the follower, forming bar and the axis of the slide yieldably to maintain said follower in operative engagement with said formin bar.

CARL G. FLYGARE. FRED T. MACKENZIE. 

